(19) |
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(11) |
EP 0 143 605 A3 |
(12) |
EUROPEAN PATENT APPLICATION |
(88) |
Date of publication A3: |
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18.12.1985 Bulletin 1985/51 |
(43) |
Date of publication A2: |
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05.06.1985 Bulletin 1985/23 |
(22) |
Date of filing: 21.11.1984 |
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(84) |
Designated Contracting States: |
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BE DE FR GB IT NL SE |
(30) |
Priority: |
29.11.1983 GB 8331860
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(71) |
Applicant: IMPERIAL CHEMICAL INDUSTRIES PLC |
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() |
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(54) |
Production of ion-exchange membrane |
(57) An ion-exchange membrane of a sheet of an organic polymer comprising a plurality
of fixed anionic groups associated with cations which comprise an organic group, e.g.
quaternary ammonium cations, a process in which the membrane sheet is expanded by
dry stretching to increase the surface area per unit weight of the membrane, a process
for its preparation, a process for converting the stretched membrane to one suitable
for use in an electrolytic cell, and that use.